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我受美國寶石學院(GIA)邀请和資助,并得到中國地質博物館領導和地礦部國際聯絡司的大力支持,於1991年6月19日赴美國參加了洛杉磯國際寶石學會議(The International Gemological Symposium)。首屆会議是1981年6月GIA為慶祝建院50週年而舉行的,以後每10年一屆。為慶祝GIA建院60週年,1991年6月隆重舉辦了本屆國際性寶石學學術盛会,這次會議GIA為東道主,與美國寶石協会(AGS)協同聯合召開。会期自6月20日至24日共5天,20日開幕式,21、22、23三天分組專題報告,23日下午閉幕式,24日上午分專題討論,下午參觀美國寶石學院。
I was invited and funded by the GIA and supported by the China Geological Museum and the International Liaison Department of the Ministry of Mines and Minerals. On June 19, 1991, I went to the United States for the International Gemological Symposium ). The first meeting was held in June 1981 to celebrate the 50th anniversary of the founding of the hospital, and every 10 years thereafter. In celebration of the 60th anniversary of the founding of the GIA, the International Gemological Symposium was held in June 1991 in a grand ceremony. The GIA was hosted by the Gemological Association of America (AGS). The meeting will be held from June 20 to June 24 for a total of 5 days, the opening ceremony will be held on the 20th, the special group reports on the days 21, 22 and 23, the closing ceremony on the afternoon of the 23rd and the seminar on the morning of the 24th. In the afternoon, we will visit the American Gemmological Institute.